ADJUSTABLE SPANNER FOR PREVENTING NUT FROM ROUNDING APEX

CLE A MOLLETTE PREVENANT L'ENDOMMAGEMENT DES ARETES D'ECROU

English Abstract

An adjustable spanner comprises a handle; one end of the handle having an enlarged head; an upper side of the head being formed with a sliding surface; a fixing jaw extended from one end of the head; the fixing jaw having a fixing surface; a fixing protrusion being formed at a lower side of the fixing surface; a movable jaw installed in the sliding trench; the movable jaw having a movable surface; a directional control element being installed in the receiving groove and engaged to the movable jaw; a movable protrusion being formed at a lower side of the movable surface; a line Y being defined from a top end of the fixing surface to the sliding surface; a line X being defined to be an axial line of the sliding trench, the angel .THETA. between the line Y and the line X is between 65° ~ 85°, preferably is 74°.

French Abstract

Clé à molette comprenant un manche. L'une des extrémités du manche forme une tête élargie et le côté supérieur de la tête comprend une surface coulissante. Une mâchoire est située à l'une des extrémités de la tête et la mâchoire est munie d'une surface de fixation. Une saillie de fixation se trouve du côté inférieur de la surface de fixation et une mâchoire mobile est placée dans la coulisse, une surface mobile se trouvant sur la mâchoire mobile. Une commande directionnelle est placée dans la coulisse et est en prise avec la mâchoire mobile. Une saillie mobile se trouve du côté inférieur de la surface mobile. Un axe y s'étend de l'extrémité supérieure de la surface de fixation à la surface coulissante et un axe x est constitué de la ligne axiale de la coulisse. L'angle thêta entre les axes y et x est de 65 à 85 degrés, de préférence de 74 degrés.

Claims

WHAT IS CLAIMED IS:
1. An adjustable spanner comprising:
a handle; a receiving groove being longitudinally penetrating through
the handle;
an enlarged head at one end of the handle; an upper side of the head
being formed with a sliding surface; the head having a transversal sliding
trench; the sliding trench communicated to the receiving groove;
a fixing jaw extended from one end of the head; the fixing jaw having a
fixing surface; and a fixing protrusion being formed at a lower side of the
fixing surface;
a movable jaw installed in the sliding trench; the movable jaw having a
movable surface; a directional control element being installed in the
receiving groove and engaged to the movable jaw; a movable protrusion
being formed at a lower side of the movable surface; a line being defined
from a top end of the fixing surface to the sliding surface; a line X being
defined to be an axial line of the sliding trench, the angel .THETA. between
the
line Y and the line X is between 65° - 85°.
2. The adjustable spanner as claimed in claim 1, wherein the angel .THETA.
is 74°.
3. The adjustable spanner as claimed in claim 1, wherein a fixing
surface of the fixing jaw and a movable surface of the movable jaw facing
to the fixing surface are parallel.
4. The adjustable spanner as claimed in claim 1, wherein the movable
protrusion has a cambered or trapezoidal shape.
5. The adjustable spanner as claimed in claim 1, wherein the fixing
protrusion has a cambered or trapezoidal protrusion.
6. The adjustable spanner as claimed in claim 1, wherein a receiving
recess is formed at a lower side of the fixing surface for receiving an apex
of a nut; and an inclined resisting surface is formed between the recess and
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the sliding surface for resisting a nut.
7. The adjustable spanner as claimed in claim 1, wherein the movable
surface has a long recess between the protrusion and the movable surface
for receiving an apex of a nut.
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Description

CA 02567082 2006-11-03
ADJUSTABLE SPANNER FOR PREVENTING NUT FROM
ROUNDING APEX
FIELD OF THE INVENTION
The present invention relates to adjustable spanners, and particularly to
an adjustable spanner for preventing a nut from rounding apexes.
Background of the invention
An adjustable spanner has two jaws for clamping a nut. Generally, in
operation, the apex of the nut will round in operation. Thus there are
many designs for improving above mentioned defects, which are for
example, USP 5878636, USP 3916735, USP 191892, USP 5152198, USP
1632911, USP 1309860, and Taiwan Patent 302793, and USP 6848343.
Taiwan Patent 302793, and USP 6848343 are invented by the inventor of the
present invention, in that inner surfaces of the jaws are formed with
protrusions and recesses.
In above mentioned structure, the designs are only suitable for some
specific nuts, they can not be used to various nuts of different
specifications.
However, the adjustable spanner is used for various nuts of different
specifications, and thus the above mentioned designs are not suitable for the
adjustable spanner. The nuts have different sizes, pitch, helix angle, etc.
However, the adjustable spanner must be suitable for these nuts. The
recesses in the inner surfaces of the two jaws of an adjustable spanner
cannot make apexes of nuts of different specifications falling into the
recesses. Thus, the apexes of the nuts are possibly rounded by the wearing
from the jaws.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide
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an adjustable spanner which comprises a handle; a receiving groove being
longitudinally penetrating through the handle; one end of the handle having
an enlarged head; an upper side of the head being formed with a sliding
surface; the head having a transversal sliding trench; the sliding trench
communicated to the receiving groove; a fixing jaw extended from one end
of the head; the fixing jaw having a fixing surface; a fixing protrusion being
formed at a lower side of the fixing surface; a movable jaw installed in the
sliding trench; the movable jaw having a movable surface; a directional
control element being installed in the receiving groove and engaged to the
movable jaw; a movable protrusion being formed at a lower side of the
movable surface; a line being defined from a top end of the fixing surface to
the sliding surface; a line X being defined to be an axial line of the sliding
trench, the angel O between the line Y and the line X is between 65 - 85 .
The various objects and advantages of the present invention will be
more readily understood from the following detailed description when read
in conjunction with the appended drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view of the adjustable spanner of the present
invention.
Fig. 2 is a plane view of the adjustable spanner of the present
invention.
Fig. 3 is a schematic view showing the operation of the present
invention, where the present invention is used to clamp a great nut.
Fig. 4 is a schematic view showing the operation of the present
invention, where the present invention is used to clamp a middle nut.
Fig. 5 is a schematic view showing the operation of the present
invention, where the present invention is used to clamp a small nut.
Fig. 6 is a schematic view showing that the adjustable spanner of the
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present invention clamps a nut.
Fig. 7 shows the nut in Fig. 6 being rotated through one angle.
Fig. 8 shows the nut illustrated in Fig. 6.
DETAILED DESCRIPTION OF THE INVENTION
In order that those skilled in the art can further understand the present
invention, a description will be provided in the following in details.
However, these descriptions and the appended drawings are only used to
cause those skilled in the art to understand the objects, features, and
characteristics of the present invention, but not to be used to confine the
scope and spirit of the present invention defined in the appended claims.
Referring to Figs. 1 and 2, the jaw structure of an adjustable spanner of
the present invention is illustrated. The present invention has the
following elements.
A body 1 has handle 10. A receiving groove 23 longitudinally
penetrating through the handle 10.
One end of the handle 10 has an enlarged head 20. One end of the head
is extended with a fixing jaw 21. An upper side of the head 20 is
formed with a sliding surface 22. The head 20 has a transversal sliding
20 trench 22. The sliding trench 22 is communicated to the receiving groove
23.
A movable jaw 24 is installed in the sliding trench 22. A directional
control element 25 is installed in the receiving groove 23 and is engaged to
the movable jaw 24. When the directional control element 25 is rotated,
the movable jaw 24 is driven to move long the sliding trench 22 so as to
change the distance between the fixing jaw 21 and movable jaw 24.
However, above mentioned structure is known in the prior art. The
directional control element 25 may be for example a worm rod as shown in
the drawing, or a button or a wedge member, etc.
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The main feature of the present invention is that a fixing surface 211 of
the fixing jaw 21 and a movable surface 241 of the movable jaw 24 facing
to the fixing surface 211 are parallel. A cambered or trapezoidal
protrusion 212 is formed at a lower side of the fixing surface 211. A
receiving recess 214 is formed at a lower side of the fixing surface 211 for
receiving an apex B of a nut. An inclined resisting surface 213 is formed
between the recess 214 and the sliding surface 22 for resisting a nut.
A cambered or trapezoidal movable protrusion 242 is formed at a lower
side of the movable surface 241. The movable surface 241 has a long recess
244 between the protrusion 242 and the movable surface 241 for receiving
an apex B 1 of a nut. A line Y is defined from a top end of the fixing
surface 211 to the sliding surface 22. A line X is defined to be an axial
line of the sliding trench 22. In the present invention, the angel0 between
the line Y and the line X is less than 90 degrees, preferably, between 65 -
85 . More preferably, it is 74 .
Referring to Fig. 3 to 5, the movable protrusion 242 can resist a center
position of an edge A of a great nut 40, a middle nut 30a and a small nut
30b.
Referring to Fig. 6 to 8, a line X2 is vertical to an edge A of a nut as
the nut is placed between the two jaws with one side resisting against the
fixing jaw 21 and one side resisting against the resisting surface. A line
Xl passing one corner B of the nut. When the angle O is 74 , the angle Ob
between the line X1 and X2 is 16 .
Referring to Figs. 6 and 8, in Fig. 7, it is illustrated that the nut is
rotated through 16 degrees from the orientation in Fig. 8. The movable
protrusion 242 still resists against at a center position of the edge A.
In above design, the apexes B, B I are in the recesses 214, 244, as
illustrated in Figs. 3 to 5. Thus the apexes 214, 244 are not in contact
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CA 02567082 2006-11-03
with the spanner. Thus the apexes will not be damaged.
Advantages of the present invention are that: the apexes of the nut will
not round. Thereby for the nut with rounded apex, the spanner of the
present invention can drive it well.
The present invention is thus described, it will be obvious that the same
may be varied in many ways. Such variations are not to be regarded as a
departure from the spirit and scope of the present invention, and all such
modifications as would be obvious to one skilled in the art are intended to
be included within the scope of the following claims.
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Representative Drawing